One fish, two fish, Dr Seuss… Mostly the fish swim singly. There are schools. They swim in bunches. Lion fish and porcupine fish are solitary. Lion fish will sometimes be seen together. But rarely have I seen two porcupine fish together. This might be odd. After all where do little porcupine fish come from? But you just don’t see them together. Maybe they are nocturnal? I can’t ask and they won’t tell.